Hezbollah has accused the Christian Lebanese Forces party of targeting demonstrators with sniper fire.
A Lebanese judge on Monday charged 68 people including 18 detainees with murder and incitement to sectarian strife over fatal clashes this month in Beirut, Lebanon's National News agency said.
Seven followers of Lebanon's Shiite Iran-backed Hezbollah group and its ally, the Amal Movement, were killed on Oct. 14 in the worst street violence in Beirut in over a decade.
The gunfire began as protesters assembled for a demonstration called for by Hezbollah and Amal against Judge Tarek Bitar, who is leading an investigation into an explosion at Beirut port that killed over 200 people on August 4 last year.
Monday's charges were filed by Judge Fadi Akiki, a government representative at the military court. They also include charges of attempted murder, possession of unlicensed weapons and destruction of public and private property.